[From Modern Garden Roses, by Peter Harkness, p. 138:] The Association of German Nurserymen organizes a competition to select roses likely to withstand different climatic conditions within the country. Each chosen rose is labeled 'Anerkannte Deutcher Rose' (ADR) and can be expected to enjoy a long commercial run.

[From Peter Schneider on Roses, by Peter Schneider, p. 11:] Winners of Germany's ADR award can be counted on for winter hardiness and disease resistance.